Border fences are really tall so it's not like you can just throw your packages of marijuana over them. No, you'd need something like a weed-apult or, better yet, a weed cannon to heave them over the wall.

There's not much to add to this AP story: "Pot-firing catapult found at Arizona-Mexico…
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Police in Mexicali, a border town between Mexico and California, have reportedly confiscated a powerful compressed air cannon used by Mexican cartels to launch packages of weed over the border. The truck-mounted device is made of PVC piping attached to an air compressor and driven by an automobile engine. It could launch up to 13 kilograms of drugs over the fence at a time. And apparently was quite productive. The police were only tipped off to the device's existence after recently seizeing a large quantity of bagged drugs that looked like they'd been shot out of a cannon. [Guardian - Image: AP Photo/Mexicali Public Safety Department